[wdmaudiodev] Re: help with virtual audio driver.

  • From: admin@xxxxxxxxxxxxxxxxx
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 12 May 2004 19:32:01 +0800 (CST)

Do you find any samples of a filter driver?
It's better to  have a sample template to start.

Another question, if you install such a driver, will it be automatically 
created and inserted into
the graph at the right position?




> Yes if you write a filter driver , it will be be in between dsound/wavout
> and the output device. The thing is i havent done implementation of this
> myself ... but i m interested in pursuing it.
>
> Regards
> Raza
>
>
>
>
>
> ----- Original Message -----
> From: <admin@xxxxxxxxxxxxxxxxx>
> To: <wdmaudiodev@xxxxxxxxxxxxx>
> Sent: Wednesday, May 12, 2004 2:43 AM
> Subject: [wdmaudiodev] Re: help with virtual audio driver.
>
>
>> Hi, Raza:
>>
>> Mainly I want to capture and have a chance to modify the audio data to
> (and from) the card.
>> I think the filter may be solution if it is between the dsound/waveout and
> the output sound device.
>>
>> I really appreciate if you can help.
>>
>>
>>
>>
>>
>>
>>
>> > Hi,
>> > I had the same issue at hand a little while ago and i wrote to a company
> who
>> > just writes DirectShow filters, they responded by sayin that this cannot
> be
>> > done using DirectShow filters and then i found out i need to write a
> upper
>> > filter for audio.sys. I am not pursuing this project anymore but just
>> > letting u know of my findings which will speed up ur decision making.
>> > Let me know if u need further help.
>> > btw i m still interested in coding it , if u agree we can do it together
> .
>> >
>> > Regards
>> > Raza
>> >
>> >
>> >
>> > ----- Original Message -----
>> > From: "Tim Roberts" <timr@xxxxxxxxx>
>> > To: <wdmaudiodev@xxxxxxxxxxxxx>
>> > Sent: Tuesday, May 11, 2004 5:50 PM
>> > Subject: [wdmaudiodev] Re: help with virtual audio driver.
>> >
>> >
>> >> admin@xxxxxxxxxxxxxxxxx wrote:
>> >>
>> >> >Thanks for the reply.
>> >> >
>> >> >Actually
>> >> >I want to make it a virtual audio driver. It don't need a specific
>> > hardware. It uses the sound
>> >> >card to play or record. But it acts like a true audio device there. So
>> > apps that use it can work
>> >> >normally, but I can have control on the data stream in this driver
> now.
>> >> >
>> >> >I have looked at MSVAD driver in WINXP DDK. It writes the data to
> disk. I
>> > wonder how to send the
>> >> >data to another true sourd device at the same time.
>> >> >
>> >> >
>> >>
>> >> I don't think you really want a driver. You want a filter. You can do
>> >> all of this in user mode by writing a DirectShow filter.
>> >>
>> >> --
>> >> - Tim Roberts, timr@xxxxxxxxx
>> >>   Providenza & Boekelheide, Inc.
>> >>
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